Upgrade Sentry: tracing, breadcrumbs, dSYM upload (#366)

* Upgrade Sentry: tracing, breadcrumbs, dSYM upload

- Enhanced Sentry SDK init with performance tracing (10% sample),
  explicit app hang timeout, stack trace attachment, and HTTP
  failure capture
- Added breadcrumbs for key user actions: workspace switch/create/close,
  split creation, command palette open/close, app focus — these give
  context to hang/crash reports
- Added dSYM upload step to nightly and release CI workflows so hang
  stacks are fully symbolicated (requires SENTRY_AUTH_TOKEN secret)
- Created SentryHelper.swift with lightweight breadcrumb helper

Closes https://github.com/manaflow-ai/cmux/issues/365

* Remove command palette breadcrumbs

Not useful for hang diagnosis — keep only workspace/tab/split/focus
breadcrumbs that correlate with heavy operations.

.github/workflows/nightly.yml

@@ -294,6 +294,19 @@ jobs:
           # by appcast URLs to prevent signature/asset mismatch races.
           cp "$DMG_RELEASE" "$NIGHTLY_DMG_IMMUTABLE"
 
+      - name: Upload dSYMs to Sentry
+        env:
+          SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}
+          SENTRY_ORG: manaflow
+          SENTRY_PROJECT: cmuxterm-macos
+        run: |
+          if [ -z "$SENTRY_AUTH_TOKEN" ]; then
+            echo "SENTRY_AUTH_TOKEN not set, skipping dSYM upload"
+            exit 0
+          fi
+          brew install getsentry/tools/sentry-cli || true
+          sentry-cli debug-files upload --include-sources build/Build/Products/Release/
+
       - name: Generate Sparkle appcast (nightly)
         env:
           SPARKLE_PRIVATE_KEY: ${{ secrets.SPARKLE_PRIVATE_KEY }}

.github/workflows/release.yml

@@ -250,6 +250,20 @@ jobs:
           xcrun stapler staple "$DMG_RELEASE"
           xcrun stapler validate "$DMG_RELEASE"
 
+      - name: Upload dSYMs to Sentry
+        if: steps.guard_release_assets.outputs.skip_all != 'true'
+        env:
+          SENTRY_AUTH_TOKEN: ${{ secrets.SENTRY_AUTH_TOKEN }}
+          SENTRY_ORG: manaflow
+          SENTRY_PROJECT: cmuxterm-macos
+        run: |
+          if [ -z "$SENTRY_AUTH_TOKEN" ]; then
+            echo "SENTRY_AUTH_TOKEN not set, skipping dSYM upload"
+            exit 0
+          fi
+          brew install getsentry/tools/sentry-cli || true
+          sentry-cli debug-files upload --include-sources build/Build/Products/Release/
+
       - name: Generate Sparkle appcast
         if: steps.guard_release_assets.outputs.skip_all != 'true'
         env: